Overview
MGAC (Modified Genetic Algorithm for Crystals) is a genetic algorithm package for molecular crystal structure prediction. MGAC2 is the updated version with improved algorithms.
Theoretical Basis
- Genetic algorithm optimization
- Molecular crystal handling
- Conformational flexibility
- Space group exploration
- Force field evaluation
Key Capabilities
- Molecular crystal CSP
- Any space group
- Multiple molecules per cell
- Conformational flexibility
- Parallel execution
Sources: J. Chem. Phys. 116, 5984 (2002), Chem. Phys. Lett. 623, 69 (2015)
Key Strengths
Molecular Crystals:
- Designed for organic systems
- Conformational flexibility
- Multiple Z' values
Flexibility:
- Any space group
- Various force fields
- Customizable operators
Track Record:
- Long development history
- Many publications
- Validated methodology
Inputs & Outputs
- Input formats: Molecular geometry, GA parameters
- Output data types: Crystal structures, energies, population history
Interfaces & Ecosystem
- Force fields: Various empirical potentials
- DFT: Optional refinement
- Analysis: Structure comparison
Workflow and Usage
- Prepare molecular geometry
- Configure GA parameters
- Select force field
- Run genetic algorithm
- Refine top structures
Performance Characteristics
- Force field-limited
- Good parallel scaling
- Efficient for molecular crystals
Computational Cost
- Force field: fast
- DFT refinement: expensive
- Parallelizable
Best Practices
- Use appropriate force field
- Enable conformational search
- Refine with DFT
- Compare with experiment
Limitations & Known Constraints
- Force field accuracy
- Molecular crystals only
- Academic distribution
Application Areas
- Pharmaceutical polymorph prediction
- Organic crystal engineering
- Molecular materials design
- CSP blind tests
Comparison with Other Codes
- vs GAtor: Similar purpose, different implementation
- vs Genarris: MGAC includes optimization
- Unique strength: Long history, molecular crystal focus
Community and Support
- Academic development (Utah)
- Published methodology
- Available upon request
Verification & Sources
Primary sources:
- GitHub: https://github.com/MGAC-group/MGAC2
- Publications: J. Chem. Phys. 116, 5984 (2002)
Confidence: VERIFIED
Verification status: ✅ VERIFIED
- Website: ACTIVE (GitHub)
- Source: AVAILABLE
- Development: MAINTAINED
- Applications: Molecular crystal CSP